Chapter 6
Momentum
Pages 100101
Lecture #5:
Agenda:
1.
Momentum
2.
Conservation of Momentum
3.
Impulse
Goal:
Explaining Linear Momentum
Content:
Word “momentum” is used in
the daily life in more or less the same meaning as in physics. A massive
object moving fast have has larger momentum compared to the momentum of the same object moving
slowly. In physics, momentum is the product of the mass of the object and its velocity. Since the motion
is linear, therefore, the momentum is called linear momentum, and is denoted by
P
. We can express
momentum as
Since velocity is a vector, therefore, momentum is also a vector quantity. Momentum unit is a product
of the units of mass and velocity, i.e., momentum is expressed as Kg.m/sec.
Momentum can be large if any or both the mass and velocity are large. However, momentum will be
zero, if the object is at rest.
System of Objects with no Net External Forces:
If you have more than one object, so that the collection of objects comprises a system, the total
momentum of the system is a vector sum of the momentums of the individual objects within the
system.
Example:
Say two objects
a
and
b
collide and bounce off each other. Say there are no other forces acting on
a
and
b
besides the forces they exert on each other. You can think that the system of two objects
a
and
b
is
isolated. Objects
a
and
b
come into contact during time t. The force object
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 Spring '11
 fsomething
 Physics, Force, Mass, Momentum, Law of Conservation of Momentum

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